Tool-holder.



No. 7|3,004. Patented Nov. 4, I902.

.1. HUNTER. TOOL HOLDER.

' J rAppl ination'medium 14. 1002., (No Model) I L 1 I Uvweufoz wdmmooUNITED ST TES PATENT OFFIQE.

TOOL-HOLDER.

SPECIFICATION forming part of Letters Patent No. 713,004, dated November4, 1902.

Original application filed October 29 1901, Serial No. 80,419. Dividedand this application filed January 14, 1902. Serial No. 89,749. (Nomodel.) i

To all whom it may concern:

Be it known that I, JAMES HUNTER, a citizen of the United States, and aresident of I-Iartford,.county of Hartford, State of Connecticut, haveinvented certain new-and usefnl Improvements in Tool-Holders, of whichthe following is a full, clear, and exact description, whereby any oneskilled in the art may make and use the same.

The invention relates particularly to an apparatus of the kind specifiedhaving features of novelty and advantage.

In the drawings, Figure 1 is a side view, partly fn section, of atool-holder embodying myinvention, showing the parts in their originalposition before beginning to cut the thread. Fig. 2 is an end view ofthe holder with the die removed. Fig. 3 is an end view of thedie-holder. Fig. 4 is an end view of the body portion. Fig. 5 is a sideview, partly in, section, similar to Fig. 1, but with the parts in theirforward position after the thread has been cut. Fig. 6 is an end viewshowing the operation of the cam-slots and the pins.

Referring to the drawings, A denotes the body part, having a reducedshank, by which it is supported in the turret of the machine. The bodypart A has two grooves B formed lengthwise along its interior face,these grooves at their outer ends opening into camshaped circumferentialslots 0 O. The dieholder D is of ordinary construction, having a recessfor the die and means, such as the screw d, for holding the die inplace. In this die-holder are located two pins E E, movable radially andcontinually pressed outward by a spring F. At the rear of the die-holderis a reduced shank G, which passes through the shank on the body partand projects beyond it. is secured a collar g, which limits the movementof the forward travel of the die-holder through the body. Projectingthrough the rear wall of the body are screws H H, which limit the inwardmovement of the die-holder. By means of these screws the length of thethread tobe out can be adjusted to any desired degree, and the tool canbe made to cut a single thread or a dozen or more by simply changing theadjustment of these screws.

The operation of the device is as follows:

At the end of the shank of the die-holder,

The die in the die-holder is presented to the blank which is to beoperated upon and which rotates as shown in Fig. 1 of the drawings. Thepins E E on the die-holder are located in the lengthwise grooves of thebody. When the die is brought into contact-with the blank, it of coursebegins to cut a thread, the dieholder being held against rotary movementby the pins E in the grooves B. I, The die-holder is, however, free tomove lengthwise of the body part, and this it will do under theinfluence of the thread which is being cut on the blank, and it willcontinue to move forward until such time as the pins come into the pathof the cam-shaped slots 0 O. The die-holder is then free to revolve withthe blank, the pins being formed to travel by the high points of thecam-slots by compressing the spring F. When the machine reverses, thedie-holder reverses its direction of rotation until the pins come incontact with the sides of the lengthwise grooves formed by the highpoints of the cam-slots. The further rotation of, the dieholder is thus.prevented, and under the influence of the thread which has been cut thedie-holder is driven backward to its original position, the pinstraveling in the lengthwise grooves in the body. The forward movement ofthe die-holder is limited by the collar g, secured to the end of itsshank.

This application is a division of my original application seriallynumbered 80,419 and filed October 29, 1901.

I claim as my invention- 1. In a device of the class specified the bodyportion, grooves arranged lengthwise thereof, said grooves opening attheir outer ends into cam-shaped slots, the die-holder capable oflengthwise movement with respect to the body, and radially-movable pinsadapted to move in the lengthwise grooves and in the cam-slots in saidbody, substantially as described and for the purposes set forth.

2. In a device of the class specified, thebody portion, grooves arrangedlengthwise thereof in its interior surface, said grooves at their outerends opening into cam-shaped slots, the die-holder capable of lengthwisemovement with respect to the body, spring-operated pins adapted to movein the lengthwise grooves and in the cam-slots in-said body, andadjustable means for limiting the inward movement body, pins carried bythe die-holder and movto of the die-holder, substantially as describedable radially with respect thereto, said pins and for the purposes setforth. engaging said grooves, and springs pressing 3. In a device of theclass specified the body the pins into said grooves, all substantially 5portion, grooves arranged lengthwise thereof, I as described and for thepurposes set forth.

cam-shaped slots formed near one end of said 1 JAMES HUNTER. bodyportion and arranged in communication Witnesses: with said lengthwiseslots, the die-holder ca- D. I. KREIMENDAHL,

pable of movement lengthwise within the M. H. C. DERBY.

